Structure of the $\mathbf{\Lambda }(1670)$ resonance

Abstract

We examine the internal structure of the $\Lambda (1670)$ through an analysis of lattice QCD simulations and experimental data within Hamiltonian effective field theory. Two scenarios are presented. The first describes the $\Lambda (1670)$ as a bare three-quark basis state, which mixes with the $\pi \Sigma$, $\bar{K}N$, $\eta \Lambda$ and $K\Xi$ meson-baryon channels. In the second scenario, the $\Lambda (1670)$ is dynamically generated from these isospin-0 coupled channels. The $K^{-}p$ scattering data and the pole structures of the $\Lambda (1405)$ and the $\Lambda (1670)$ can be simultaneously described well in both scenarios. However, a comparison of the finite-volume spectra to lattice QCD calculations reveals significant differences between these scenarios, with a clear preference for the first case. Thus the lattice QCD results play a crucial role in allowing us to distinguish between these two scenarios for the internal structure of the $\Lambda (1670)$.

Comments: 13 pages, 5 figures, 1 table; accepted by Phys. Rev. D